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Windom baluns for kilowatt range
Windom balun made with Amidon ferrite toroids
post 11 May 2024
Antenna Multibands Links →
Morgain raccorciata per i 40-80 metri, IT9ECY
The antenna described here is known by different names. It is a combination of two dipoles shortened with coils and thus the tires 80-40-20-15 and 10 meters
Multiband HF Center-Loaded Off-Center-Fed Dipol
ON4AA CL-OCFD with 80, 40, 30, 20, 15 10 m coverage. The capacitor C shortens the dipole for 80 m actually 75 m band resonance, whereas the coil lenghtens the dipole for 30 m third harmonic resonance. Resistor R has as sole function bleeding off static charges, protecting capacitor
Folded dipoles
Obviously, the title Folded dipole is not appropriate, it is to confuse the whole with one of its parts
Loop antenna multiband horizontal
This multiband antenna covers the 80, 40, 30, 20, 17, 15, 12, 10 and 6 Mx Amateur bands. Multiband operation is achieved by use of 300 ohm balanced line fed to an antenna tuner
Multibands 3,5 to 28 Mhz
My version of this antenna works from 3.5 to 28 MHz
156
The antenna described here is known by different names. It is a combination of two dipoles shortened with coils and thus the tires 80-40-20-15 and 10 meters
ON4AA CL-OCFD with 80, 40, 30, 20, 15 10 m coverage. The capacitor C shortens the dipole for 80 m actually 75 m band resonance, whereas the coil lenghtens the dipole for 30 m third harmonic resonance. Resistor R has as sole function bleeding off static charges, protecting capacitor
Obviously, the title Folded dipole is not appropriate, it is to confuse the whole with one of its parts
This multiband antenna covers the 80, 40, 30, 20, 17, 15, 12, 10 and 6 Mx Amateur bands. Multiband operation is achieved by use of 300 ohm balanced line fed to an antenna tuner
My version of this antenna works from 3.5 to 28 MHz
23cm Yagi Antenna building Finished antenna at 1275 MHz SWR under 1:1.5 at resonant frequency
50 MHz preamp Gain 26dB with the BFG135 Preamps for 144 and 430 MHz, for 50 MHz, the BFG135a is a cheap transistor and in my view rather strong. It is not easily damaged by static discharge or RF power. FG connection
30 Volt Computer Power Supply Stack A bonus was that i discovered that these did not need a standby load connected to the supply to keep them running just apply mains power and close the Start lead to ground